Loulan is believed __________ over by sandstorms gradually from AD200 to AD400.
A.to cover | B.to be covered |
C.to have covered | D.to have been covered |
推荐套卷
Loulan is believed __________ over by sandstorms gradually from AD200 to AD400.
A.to cover | B.to be covered |
C.to have covered | D.to have been covered |